The Edirol VSC served the same function the Cakewalk TTS-1 now fills - as a good GM module to start up projects with. The patches in your old files will have the instruments numbered as per the GM spec, so even though the sound will be different, and the balance may need adjusting, it should be easy to use the TTS-1 to take over since the VSC isn't available. The patch changes may even be there in your track headers.
I used the VSC on my XP desktop up until not all that long ago, when I was still using Home Studio 6.
rbowser